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Q: no heat in 3 of 4 vents speedometer off by 50 miles over on 2004 GMC Sierra 1500

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
heat defrost work only on passinger side.Recently went out of right passinger side only in middle.Thought it might be heater door actuator.I will admit I mixed anti-freeze this summer. SPEEDOMEETER went wacky 2 days ago at first 20 miles over now 50 miles over,even at rest and shut off thank you, I checked most of the fuses
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